A great plot could involve Ash competing in a local Alola tournament that has some really strange and unique rules. This would force him to think outside the box and use different battle strategies. He might also make some new friends or rivals during this tournament who have their own interesting stories and Pokémon.
One interesting storyline could be Ash forming a unique bond with a rare Alola Pokémon. Maybe he discovers a Pokémon that has special powers and they go on adventures together to help it control and understand those powers.
Another idea is that May decides to study Pokémon in Alola for a research project. Ash joins her to help. They visit different islands in Alola and encounter unique Pokémon training styles. They also face a group of poachers who are trying to steal some of the Alola Pokémon. Ash and May must use their skills and the help of their Pokémon friends to stop the poachers and protect the Alola Pokémon.
Perhaps there could be a plot where Charizard accidentally causes a wildfire in Alola. Ash then has to take responsibility and with the help of the local Pokémon and trainers, they work together to put out the fire and repair the damage. This would show the importance of environmental protection and how Ash and Charizard learn from their mistakes in a new region.
Perhaps in the fanfiction, Ash and Serena could stumble upon a mysterious Alola Pokémon that is said to have the power to grant wishes. They then go on an adventure to find this Pokémon, while also exploring the beautiful and diverse regions of Alola. During their journey, they help local Pokémon trainers with their problems and learn more about the Alola culture.
In the fanfiction, Alola Lily could be a Pokémon researcher. Ash visits her research center and they start working on a project together, like studying the evolution of a certain Alola Pokémon. As they spend long hours observing and documenting, they start to have deeper conversations. They discover they both have a passion for understanding Pokémon better, and this common ground leads to a romantic relationship. Their love might be tested when Ash has to leave for another region for a Pokémon tournament, but they find ways to stay connected.
One idea could be that Ash and his Pokémon team up with each of the girls in the Alola harem to compete in a special tournament. They train together, share their Pokémon training techniques, and during this process, their relationships deepen.
Professor Kukui is another common character. He serves as a guide and mentor to Ash in the Alola region. He might provide Ash with new Pokémon knowledge, especially about the unique Alola Pokémon species. And of course, there are the various Pokémon trainers that Ash meets and battles in the Alola region. These trainers can range from novice trainers just starting out to more experienced ones who pose a real challenge to Ash.
The climate in Alola might affect Charizard. Since it's a tropical region, it could make Charizard a bit more adaptable to warmer and more humid conditions. Maybe its fire - type moves will become even more powerful because of the abundant sunlight in Alola.
In this fanfiction, Ash might make new friends in the Alola region. He could encounter unique Pokémon there that he has never seen before, like the Alola forms of some Pokémon.
He might meet new Pokémon trainers in Alola. Maybe some young kids who are just starting their own Pokémon journey.